FL Deal Flow - Getting upstream

After spending the past month polishing my Buyer Profile and obtaining an SBA Funding Pre-Qualification Letter, I've just really kicked off my full-time search. One of the early challenges I'm seeing is that most brokers in Florida rely on the centralized MLS-style listings, where they don't represent either the seller or the buyer.

One of the strategies I was initially trying to implement early on is getting upstream on deal flow - ie. email lists of serious, qualified buyers that get first pass on deals before they hit the various public listing sites. I've chatted with some brokers who have these lists, but they don't seem to be the broker representing the seller - again, they're relying on the MLS. Thus, I'm seeing the same deals with most of the brokers I speak with.

Any tips or tricks on how to efficiently and effectively navigate this? Thank you!